/Engine/Source/Editor/UnrealEd/Public/WorkflowOrientedApp/WorkflowTabManager.h
Retrieves the payload from the current history data, which is being displayed by the tab
[TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [FTabPayload](API\Editor\UnrealEd\WorkflowOrientedApp\FTabPayload) > GetPayload() const